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This CL adds a command line switch that enables the kLiveCaptionEnabled
preference which will make it easier to add Swarming tests.

Bug: 1122784
Change-Id: I27f0f4ae4a0b19b97f454336f1ca5f372b1e50cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382961Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Evan Liu <evliu@google.com>
Cr-Commit-Position: refs/heads/master@{#803205}